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Further Workplace Health and Safety bosses will be grilled at the inquest into the Dreamworld disaster today, after a leading inspector admitted he had "no confidence" in the emergency procedures in place on the Thunder River Rapids ride.

"I have been informed that you have not been able to reach a decision," the judge said.

The jury had heard four days of intensive evidence from two psychiatrists and a psychologist, who all agree in their diagnosis that Gargasoulas has paranoid schizophrenia. Of these three medical professionals, only the psychologist deemed the 28-year-old fit to stand trial.

The defence argues he is "profoundly psychotic", believing he is the "Messiah" sent to save the world from a comet, and should not stand trial.

But prosecutors said Gargasoulas should face trial, claiming he understands his case and can make decisions about his defence and plea.

"(He) has the presence of mind to know that if it's his lot in life to be saving the world, he wants to be doing that from the relative comfort of Thomas Embling Hospital, rather than the 23-hour lockdown of prison,' crown prosecutor Andrew Tinney SC said.

Six people died on Bourke Street Mall in January last year. ()

Justice Lasry said he could dismiss the jury without a verdict if they could not reach one but he was not yet ready to do so.

"Experience has shown that juries, given more time to discuss, can reach a verdict," he said.

"That's what I'm going to ask you to do. Come back in the morning, hopefully fresh."

Justice Lasry urged the jury to share their feelings and listen to others, as their views may shift.

Gargasoulas is facing six murder charges over the deadly rampage. (9NEWS) (9NEWS)If the jury is dismissed, a re-trial would have to be held. (9NEWS) (9NEWS)

But he said they can't change their minds simply for the sake of reaching a decision.